#include <iostream>
#include <vector>
#include <string>

std::vector<std::pair<char, int>> runlength(const std::string& s) {
    std::vector<std::pair<char, int>> res;
    for (char c : s) {
        if (res.empty() || c != res.back().first) {
            res.emplace_back(c, 1);
        } else {
            ++res.back().second;
        }
    }
    return res;
}

void solve() {
    std::string s;
    for (int i = 0; i < 14; ++i) {
        char c;
        std::cin >> c;
        s.push_back(c);
    }

    auto ps = runlength(s);
    int ans = 0;
    for (auto p : ps) {
        if (p.first == 'o') ans = std::max(ans, p.second);
    }

    std::cout << ans << std::endl;
}

int main() {
    std::cin.tie(nullptr);
    std::cout.tie(nullptr);
    std::ios::sync_with_stdio(false);

    solve();

    return 0;
}